[1] Man page of SHUTDOWN (2/5/2015, 9:34:06 PM 版) <http://linuxjm.osdn.jp/html/LDP_man-pages/man2/shutdown.2.html>

[2] shutdown (4/26/2011, 1:57:53 PM 版) <http://chokuto.ifdef.jp/advanced/function/shutdown.html>